Metals -> High-temperature or heat-resistant steel and alloy -> Low alloy high-temperature steel Characteristics of the material 12MKH ( 12MH, 12МХ ).
Material : 12MKH ( 12MH, 12МХ ) Classification : Low alloy high-temperature steel
Chemical composition in % of the material 12MKH ( 12MH, 12МХ ) . C Si Mn Ni S P Cr Mo W V Ti Cu 0.09 - 0.16 0.17 - 0.37 0.4 - 0.7 max 0.3 max 0.025 max 0.03 0.4 - 0.7 0.4 - 0.6 max 0.2 max 0.05 max 0.03 max 0.2
Temperature of critical points of the grade 12MKH ( 12MH, 12МХ ).
Ac1 = 723 , Ac3 (Acm ) = 885 , Ar3 (Arcm ) = 803 , Ar1 = 715
Mechanical properties under Т=20o С of the material 12MKH ( 12MH, 12МХ ) .
Assortment Dimension Direct. s в s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Bar Ж 90 410 235 21 45 590 Normalizing 910 - 930o C, air, Drawing 670 - 690o C,
Brinell hardness of the material 12MKH ( 12MH, 12МХ ) (heat treatment) , HB 10 -1 = 156 MPa Brinell hardness of the material 12MKH ( 12MH, 12МХ ) (quenching, tempering) , HB 10 -1 = 182 MPa Brinell hardness of the material 12MKH ( 12MH, 12МХ ) (hot-rolled, annealing) , HB 10 -1 = 217 MPa
Physical properties of the material 12MKH ( 12MH, 12МХ ) . T E 10- 5 a 10 6 l r C R 10 9 Grade MPa 1/Grade Watt/(m·Grade) kg/m3 J/(kg·Grade) Ohm·m 20 2.12 7850 100 2.06 11.2 50 7830 473 240 200 2 12.5 50 7800 519 330 300 1.95 12.7 50 7760 565 410 400 1.89 12.9 49 7730 594 540 500 1.79 13.2 47 7690 653 640 600 1.7 13.5 46 7650 733 740 700 1.6 13.8 44 7610 888 900 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 12MKH ( 12MH, 12МХ ) . Weldability: without limitations. Flakes : predisposed Temper brittleness: not predisposed
Specification :
Mechanical properties : s в - Tensile strength , [MPa] s T - Yield stress, [MPa] d 5 - Specific elongation at fracture , [ % ] y - Reduction of area , [ % ] KCU - Impact strength , [ kJ / m2 ] HB - Brinell hardness , [MPa]
Physical properties : T - Test temperature , [Grade] E - Young modulus , [MPa] a - Coefficient of linear expansion
(range 20o - T ) , [1/Grade] l - Termal (heat) condition coefficient , [Watt/(m·Grade)] r - Density , [kg/m3 ] C - Specific heat
( range 20o - T ), [J/(kg·Grade)] R - Electrical resistance , [Ohm·m]
Weldability : without limitations - welding is done without heating and subsequent heat treeting limited weldability - welding is possible under heating up to 100-120 grade and subsequent heat treeting hard weldability - obtaining the quality welding needs the additional operations:heating up to 200-300 grade; the heat treeting ia annealing
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